Regulation of the Si/Al ratios and Al distributions of zeolites and their impact on properties

J Li, M Gao, W Yan, J Yu - Chemical Science, 2023 - pubs.rsc.org
Zeolites are typically a class of crystalline microporous aluminosilicates that are constructed
by SiO4 and AlO4 tetrahedra. Because of their unique porous structures, strong Brönsted …

Silanol defect engineering and healing in zeolites: opportunities to fine-tune their properties and performances

IC Medeiros-Costa, E Dib, N Nesterenko… - Chemical Society …, 2021 - pubs.rsc.org
Zeolites have been game-changing materials in oil refining and petrochemistry over the last
60 years and have the potential to play the same role in the emerging processes of the …

Conversion of methanol to olefins over H-ZSM-5 zeolite: reaction pathway is related to the framework aluminum siting

T Liang, J Chen, Z Qin, J Li, P Wang, S Wang… - Acs …, 2016 - ACS Publications
As the conversion of methanol to olefins (MTO) over a zeolite catalyst is conducted on acid
sites derived from framework aluminum (AlF), it is possible to enhance the catalytic …

Siting and distribution of framework aluminium atoms in silicon-rich zeolites and impact on catalysis

J Dědeček, Z Sobalík, B Wichterlová - Catalysis Reviews, 2012 - Taylor & Francis
Siting of Al atoms in the framework T sites, in zeolite rings and channel/cavity system, and
the distribution of Al atoms between single Al atoms and close Al atoms in various Al-O-(Si …

Tuning the aluminum distribution in zeolites to increase their performance in acid‐catalyzed reactions

J Dědeček, E Tabor, S Sklenak - ChemSusChem, 2019 - Wiley Online Library
The organization of Al atoms in the framework of Si‐rich zeolites is very important and
includes two classes:(i) the Al siting that determines which individual, crystallographically …

Recent advances in application of 27Al NMR spectroscopy to materials science

M Haouas, F Taulelle, C Martineau - Progress in nuclear magnetic …, 2016 - Elsevier
Valuable information about the local environment of the aluminum nucleus can be obtained
through 27 Al Nuclear Magnetic Resonance (NMR) parameters like the isotropic chemical …

Al distribution and catalytic performance of ZSM-5 zeolites synthesized with various alcohols

T Biligetu, Y Wang, T Nishitoba, R Otomo, S Park… - Journal of …, 2017 - Elsevier
The distribution of Al atoms in ZSM-5 has been recognized as an important factor in catalytic
activity. Here, ZSM-5 zeolites were synthesized from synthetic gels containing various …

Quantitatively probing the Al distribution in zeolites

A Vjunov, JL Fulton, T Huthwelker, S Pin… - Journal of the …, 2014 - ACS Publications
The degree of substitution of Si4+ by Al3+ in the oxygen-terminated tetrahedra (Al T-sites) of
zeolites determines the concentration of ion-exchange and Brønsted acid sites. Because the …

Synthesis of ZSM-5 zeolites with defined distribution of Al atoms in the framework and multinuclear MAS NMR analysis of the control of Al distribution

J Dedecek, V Balgová, V Pashkova, P Klein… - Chemistry of …, 2012 - ACS Publications
Sets of ZSM-5 zeolites with different distributions of Al atoms in the framework were
synthesized from the mixtures of Si/Algel 25–90, varying in the sequence of mixing and …

Control of hierarchical structure and framework-Al distribution of ZSM-5 via adjusting crystallization temperature and their effects on methanol conversion

S Kim, G Park, MH Woo, G Kwak, SK Kim - ACS Catalysis, 2019 - ACS Publications
Incorporating mesoporosity into zeolite catalysts has been regarded as an innovative
technology that improves diffusivity and catalytic lifetime. Here, we propose a facile …